If you want to say it more politely, use the
“te verb form, with kudasatte ／kudasari arigatou gozaimasu”
ex)
彼のようなすばらしい人材を紹介してくださって／くださり、ありがとうございます。
Kare no youna subarashii jinzai o shoukai shite kudasatte / kudasari arigatou gozaimasu.
Thank you for introducing us a wonderful person like him.